Hybratrlic transmission



C. B. FUNK.

HYDRAULIC TRANSMISSION.

APPLICATION FILED JUNE 5. 1916.

1,346,086. atent d uly 6, 1920.

s SHEETS-SHEET- 1".

C. B. FUNK.

HYDRAULIC TRANSMISSION.

APPLICATION HLED JUNE 5,1916.

1,346,086. Patent d July 6, 1920.

6 SHEETS-SHEET Z.

C. B. FUNK.

HYDRAULIC TRANSMISSION.

APPLICAYION FILED JUNE 5.191s.

Patented July 6, 1920.

6 SHEETS-$HEET 3 C. B. FUNK.

HYDRAULIC TRANSMISSION APPLICATION FILED JUNE 5 1916.

Patented July 6, 1920.

6 SHEETS-SHEET 4.

C. B. FUNK.

HYDRAULIC TRANSMISSION.

APPLICATION FILED JUNE 5.1916.

C. B. FUNK.

HYDRAUUC TRANSMISSION.

AIPLICATlON FILED JUNE 5, me.

1,346,086. t d uly 6, 1920.

6 SHEETS--SHEET 6. .211 7 CARLYLE B. FUNTiI, or CHICAGQ, rumors.

HYDRAULIC TRANSMISSION.

Specification of Letters Patent.

Application filed June 5. 1916. Serial No. 101,787.

scription of the same, reference being had.

to the accompanying drawings, and to the numerals of reference markedthereon, which form a part of this specification.

This invention relates to a unit type hydraulic power transmissionwherein a drive 4 is effected between the driving and driven members bycausing a flow of fluid to take place therebetween, so that by controlof the fluid flow, variations in speed or power may be obtained within awide range and, at the same time a transmission of great flexibility andnoiseless operation is secured.

t is an object therefore of this invention to construct a fluid powertransmission mechanism for transmitting a drive between a driving anddriven member wherein any one of a practically infinite number of speedsmay be obtained by manipulation of means controlling the flow of thefluid.

It is also an object of this invention to construct a power transmissionmechanism embracing pumping means for supplying fluid under pressure anda fluid motor connected with said pumping means to be driven by thefluid pumped therefrom, and with mechanisms associated with the systemfor controlling the flow of the fluid to vary the power transmitted orthe rate of drive, as desired.

It is furthermore an important object of this invention to construct adevice wherein fluid under pressure acts to drive a hydraulic motorconnected to a driven member, the flow to said motor maintained by afluid driving or pumping means connected to a power plant of anysuitable type.

It is furthermore an important object of this invention to construct afluid power transmission mechanism wherein the driving and drivenmembers are associated with in a single casing which is cored out andprovided with suitable passages to admit of a flow between the drivingand driven members of the transmission, together with suitable means forcontrolling the flow of fluid.

It is finally an object of this invention to construct a simple type ofself-contained fluid transmission mechanism wherein the e powertransmitted and rate of drive is .rogulable by controlling the flow ofthe fluid. The invention (in a preferred form) is: illustrated in thedrawings and hereinzfier more fully described. I f

In the drawings: s (1.;- F gure 1 is an extesior; me view *nfiaa' deviceembodying thepr'mciplesof mysi ivention. 1 Fig. 2 is a section taken online 2-- 2lof *1 j ig. 3 is a section taken on line 3-3 of" Fig. 2.

Fig.

Fig. 5 is a section taken on line 5-5 of I Fig. 2.

Fig. Fig. 2.

Fi 7 Fi .3.

ig. 8 is a detail section taken oivlinev 8-8 of Fig. 3. v- Fig. 9 is anexterior 4 is a section taken online JP-4 6 is a section taken on line6--6 of 7 5* is a section taken on line 7 -7 viewiof the cm; head pistonmember of a rotor used both in the driving and driven member of thetrans mission. J i

Fig. 10 is a detail section taken oar-line 10 10 of Fig. 9. c a Fig. 11is a detail section taken: onsline 11-11 of Fig. 5. 1

Fig. 12 is a section taken on linel2-12: of Fig. 11. i 1

Fig. 13 is a fragmentary'dctail section taken on line 13-13 of Fig. 3. Iw Fig. 14 is a fragmentary detail section f taken on line l4-14 of Fig.3, with parts omitted. Y Fig. 15 is a plan view of the partsfihow 1 inFig. 14. 1

Fig. 16 is an elevational view. of one oi the sets of segmentalretaining. rings for packing material. Fig. 17 is a similar View ofanother set of: rings for a similar purpose.

Fig. 18 is a detail section taken on line l8-18 of Fig. 2. Y Fig. 19 isa fragmentary plan or develop. m6 ment view of the labyrinth bearingpacking 1 member provided at one point in the inner wall of the casingof the transmission.

As shown in the drawings: V The transmission casing within which the nor tenteasiiiiyliiaa fii struction, and a sectional view through thedriving end of the casing and the driving member and its componentparts, is shown in'detail in Fig. 7. i 1 I As, shown, a short shaft 3,having a squared end .4, is mounted axially in the casing at one side ofthe partition wall 2, with the squared end 4, seating in a squaredrecess therefor in the partition wall, to hold said shaftrigidly inposition and stationary within the casing. Mounted uponsaid shaft 3, isan eccentric cylinder 5, which is keyed rigidly thereon by akey 6, shownin Fig. 7. Journaled upon said shaft 3, at the ends thereof beyond thekey 6, is a rotor comprising circular end members ,7 and 8,respectively, and a hollow cylindrical portion 9, with which thecircular end member 7, is integral, and to which the circular end member8, is rigidly secured by means of machine screws 10, inserted throughradial apertures of an extension 11, formed integral with saidcylindrical member 9. A segmental ring '12, consisting of threesegments, shown in Figs. 17.and 18, interfits with a peripheral flange13, formed on the end member 8, and extends over the cylindricalextension 11, of the member 9, and is provided with peripheral groovesin which circular strips of packing 14:, which fit into correspondingrecesses provided therefor in the casing 1, are fitted. The purpose ofmaking the ring 12, segmental, is to permit the sameto be easily placedwithin the easing 1, to hold the packing rings 14:, in place.Jolllllilled upon the eccentric cylinder 5, withinthe rotor cylinder 9,is a ring 15, which at diametrically opposite sides, is providedwithflattened surfaces 16, and slidably mounted upon the. flattenedportions16, of said ring and rotatable as a unit therewith, is'a yoke shapedcrosshead member 17 flattened at'its ends to SlideaWithin the cylinder9, and which, on opposite sides, is provided with radial vanes or pistonabutment members '13 which engage slidably through transverse slotsprovided therefor in the rotor cylinder 9. Packing material 19, isprovided on each side of the slot in the cylinder 9, to bear against thepiston members 18, slidable.therethrough, and at the ends and outersurface of said piston members, packing material 20, is provided, re-

cessed into said members as shown in Fig. 7. The other circular endmember '7, which is integral with the cylindrical member 9, is providedwith peripheral grooves to receive packing rings 21, therein, and asegmental ring 22, consisting of three sections, shown in detail in Fig.16 and in section in Fig. 7, is provided to afford a bearing for said ofpower, such as an engine or the like, is

journaled through the end cover plate member 23, and on its inner end isprovided with a disk coupling head 26, fitting and rotatable in a recessin the inner surface of the cover plate 23, and connected by bolts orrivets 2,7, to the end member 7, of the driving rotor of thetransmission mechanism. The outer hub extension of the end cover platemember 23, is recessed and provided with packing material28, and apacking gland 29, fits thereover and is secured thereto in any suitablemanner.

7 At one side of'the chamberwithin which the driving rotor operates, afluid outlet passage 30, is provided, as shown in Fig. 3, with a smallair trap chamber 31, communicating in the upper end thereof and saidpassage 39, communicates through a valved outlet with an outlet orpressure chamber 32, having an air trap 33, formed at the upper endthereof, entrance into which is controlled by an automatic valve 34,normally held closed by a spring 35. The stemof said valve 3 1,

is slidable in a long tubular extension 36, of

a closure plug 37,-which is threaded into one wall'of the casing 1. Alsoformedwithin said casing 1, at one side of and communieating 1 with thechamber within which the rotor 9, operates, is an inlet chamber 38,

adapted when swung upwardly to close off communication between the upperportion of the chamber 38, and an inlet passage 44, leading to thechamber within which the rotor 9, is mounted. Suspended beneath thepartition 41, .and releasably connected in inclined position, are agroup of spaced screen trays 15, through which the fluid is constrainedto flow when the gate 42, is swung upwardly,so that a .flow takes placefrom the lower portion of the chamber 38,

upwardly into the. entrance passage 44, t0-

the rotor.

Another mechanism is also provided to control the flow of fluid to therotor through the entrance passage 44, leading thereto. This mechanismconsists of a gate plate 46, as shown in Figs. 3 and 13, slidable ininclined position across the entrance passage 44, in guideway slotsprovided therefor on the interior of the casing 1, and provided with atoothed rack 47, centrally thereof, adapted to co-act with a pinion 48,secured upon a shaft 49, j ournaled through the easing 1, whereby saidgate may be adjusted to any position to regulate the flow through theentrance passage 44, to the rotor 9.

As already mentioned, the driven rotor of the transmission mechanism,also mounted within the casing 1, is exactly similar and identical withthe driving rotor just described, and consists of a rotor cylinder 50,through which the piston abutments 51, slide, of a crosshead 52,operating therewith, a detail view of which is shown in Fi 4. As in theconstruction previously descri ed, the crosshead 52, is flattened on itsends and slides upon flat surfaces provided on the interior of thecylinder 50, and the inner sides of said crosshead are flattened andslide upon flattened surfaces of extensions 'of a ring 53, which isjournaled upon an eccentric 54, rigid upon a shaft 55, stationary in thecasing 1, with its squared end 56, seating in a complemental squaredrecess therefor. The driven rotor 50, is, as in the constructionpreviously described, provided with a segmental retaining ring 57, forpacking rings 58, at one side, and with packing rings 59, mounted inrecesses of the integral extension 60, at the other end thereof, and thecasing is closed by a cover plate 61, through which a driven shaft 62,bolted on the interior of the casing, to the integral end 60, of saidrotor, extends. The chamber within which the driven rotor 50, operates,is provided with an inlet chamber 63, cored in the casing 1, at one sideof the rotor chamber, and with an outlet chamber 64, disposed thercaboveand separated from said inlet chamber by a partition 65.

Cored within the casing 1, between the respective inlet and outletchambers of the respective driving and driven rotors, is a cylindricalchamber or compartment 66, within which is mounted a rotatablecylindrical valve element 67, shown in detail in Figs. 11 and 12. Saidrotatable valve element 67, is provided with curved passages 68 and 69,in the same plane therethrough at one end thereof, another curvedpassage 7 0, through the middle thereof, and another curved passage 71,at the other end thereof. The cylindrical recess 66, within which saidrotatable valve element 67, is mounted, is

closed by a cover plate 72, shown in detail in Fi 11, and an actuating.stem .73 rotat ble valve extends theretlirougli' to which any suitableactuatingmeans may be connected. An outlet passage 73*,"is evided at oneside in the lower end of t he chamber 32, as shown in Fig. 5,8nd11n'ifllet passa e 74, is provided at one side in the. lower en of theinlet chamber 63, so that communication may be established there betweenthrough the passage 70, of the valve element. An outlet passage 75, isprovided.

at one side of the chamber 64,- andan inlet passage 76, is provided atone side of the inlet chamber 38, so that communication may beestablished through the p w; 71, of the valve element when the same issoadjusted. The valve element 67, has three positions" of adjustment, theone such as shown in Fig. that is, with the passage 70, afiordingcommunication between the outlet passage 73, and inlet passage 74, andthe passa e 71, affording communication between t outlet passage 75, andinlet passage 76, so

that a flow of fluid from the driving rotor; to the driven rotor maytake place and re{ turn. Another position of adjustment is with thepassage 68, in communication with the outlet passage 73, and passage 75,andwith the passage 69, afi'ording communica tion between the passage74, and inlet passage 76, so that a flow may take-place tween thedriving and driven rotor, but with the direction of flow to the drivenrotor reversed, so that a reverse drive is affected. Another position ofad'ustment of the valve element 67, is one 0 neutral or idling positionwherein the valve element is rotated so that the passage 69,short-circuits the flow from the outlet passage 78", to the inletpassage 76, of the driving rotor, and the passage 68, effectscommunication between the passage 75, and passage 74, of the drivenrotor. i

Formed in the main casing 1, atone endthereof adjacent the outlet orpressure chamber 32, of the driving rotorvis a sum or well 74", shown inFigs. 2 and5, whic at its lower end communicates with the chamber 38,and a filler or entrance passage 75*, is provided at the upper-endthereof. having a closure plug 7 6, by which the oil or othertransmission fluid maybe intro duced. Normally resti upon an inner ledge77, at the upper en of the sump well? seal between-the inlet and outletto the rethis transmission. Referring to Figs. 1, 2, and 3, a pipe 81communicatesthrough the end wall of the casing 1, intov the pressurechamber 39, and extends along the exterior at the end oi? the casing andbranches downwardly into a three way L 82, from which a pipe 83, leadsinwardly through the end cover plate 23, as shown in Fig.2, to admit oilunder pressure to the end of the rotor. Leading outwardly from the L 82,is a pipe 8 1, which is connected to an L 85, and a short pipe sectionto a T 86. A pipe 87, is connected on from the T 86, to another T 88 andS9, and at its end leads to a pipe 90, L 91, and by pipe 92, through theend cover plate (3.1, for admission to the end ofthe rotor similar tothe pipe 83, described. A-

short pipe section 92, connected into the l 89, and threaded into acored out passage 93, which meshes at its lower end to admit the oilunder pressure to the inner end of the respective rotor elements.Downwardly directed pipes 94, are connected into the respective Ts 86'and 88, and are connected to inwardly directed horizontal pipes 95, eachof which is connected. to a short pipe section 96, and is threadedinwardly through the bottom of the casing 1, as shown in Fi (3.

.I he piping 1'01 equalizing the pressure in applying lubricant to thebearings of the driven rotor, cousists'of one pipe 9?, commi'lnicatinginto the chamber 63, as shown in Fig. 5, and leading outwardly andupwardly through a check valve 98, to branch pipes 99, both of whichcommunicate through the walls of the casing, as shown in Fig. 6. Anotherpipe 109, communicates through the end wall of the casing into thechamber 64, as shown in Fig. 5, and leads outwardly and downwardly andto a check valve 101, to branch pipes 102, which communicate upwardly inthe bottom of the casing, as shown in detail in Fig. 6.

Fig. 19 illustrates a. detail of an inserted labyrinth packing 193, oneeach thereof being provided in the respective rotor chambers, clearlyshown in Figs. 3, l, and 6,

against which the cylindrical portions 9 and 50, of the respectiverotors bear to afford a spective rotors. Drip connections 104; and 105,respectively, are provided at each end of the transmission casing coverelements to provide a means of trapping and straining oil which may findaccess to the end bear-,

ings. i v

The operation is as follows:

The driving rotor, rotating within the casing l, embraces thecylindrical member 9, and piston abutments 18, and inasmuch as saidcylindrical element rotates about one center, namely the shaft 3,aud'said abutments about another center, namely the eccentricallydisposed cylinder 5, a relative movement takes place therebetween, theabutments sliding, through the packed slots in the walls or saidcylindrical element 9, as 7 of ,fluid from the chamber 38, is drawnthrough the open gate valve 4:6, said fluid flowing behind one of theabutments 18,

and the following abutment, as it sweeps; across the inlet passage 4a,traps the fluid V and forces the same upwardly around the rotor chamberinto the chamber 30. As the pressure of the fluid in the chamber30,augments,thevalve 34:, opens automatically against the compression ofits spring, and the fluid then flows into the outlet or pressure chamberFor both the chambers 39 and 32, the air bellor trap chambers 31 and 33,respectively are provided, so that the ir therein'may be'compressed asthe fluid is pumped into said respective chambers, in asi'nuch as thefluid itself is practically incompressible. The fluid leaving thechamber 32, through the wide outlet passage 73, shown in Fig. 5, passesthrough the cylindrical plug valve 67, that is, in the adjustment shown,the fluid passes through the passage 70, into the lower chamber 63,which in the present instance forms the inlet chamber tor the drivenrotor,

lVithin the driven rotor chamber practically a reverse operation takesplace from that already described, that is, the fluid entering throughthe chamber 63, flows upwardly behind one of the abutments 51,,

inlet chamber 38, of the other rotor element,

The driven rotor element 50,1112ty be caused to rotate in an oppositedirection by adjustment of the valve (37, so that a flow from the outletpressure chamber 32, takes place through the passage 8, of the valveelement into the.upper chamber 6%, of the drivenrotor element, rotatingthe same in.

a clockwise direction with reference to 4-, the fluid leaving by thechamber 63, through the passage (39, of the valve clement,

returning to the inlet chamber 38, of the driving rotor. I

Said valve 67, is capable of another adjustment to a neutral position,that is, with the passage 69, connecting the outlet passage 73*, andinlet passage 76, ot the driving rotor element, and the passage 68,connecting the respective passages 74 and '4' 5, of the driven rotorelement. When it is desired to strain the fluid of: the transmissionmechanism, the shaiit 13, 1S turned through an angle of ninety degreeson the exterior of the casing. thereby throwing the gate 42, shown inFig. 3, upwardly to close the passage 44, so that the fluid entering thechamber 38, is constrained to flow downwardly and upwardly through thescreen trays 45, for admission past the gate valve 46, to the drivingrotor 9. The gate valve 46, shown in Fig. 3, affords a means ofcontrolling the power transmitted by the transmission mechanism inasmuchas said gate valve controls the quantit of fluid admitted to the drivingrotor. t is also evident that this also affords a means of governing thespeed of the driven rotor, inasmuch as the speed will depend upon theload to be driven by the driven element, as well as the quantity offluid pumped thereto by the driving rotor. Inasmuch as the abutments,both in the driving rotor as well as the driven rotor, rotate about aslightly variable center, the path traced by the outer end of saidabutments is not exactly circular. However, for ease of manufacture, theinterior of the casing against which the outer ends of the abutmentsbear, is made purely circular, and the slight inaccuracy is compensatedfor by the packing 20, in the ends of the respective rotor abutments,which is of a resilient nature so as to normally spring outwardly, andyet capable of being compressed inwardly to afford an eflicient seal atall points of movement of the rotor abutments within the casing.

The piping connections for equalizing pressure upon the ends of therotor elements and lubricating the same, utilizes in a novel manner thepressure existent in the mechanism for forcing the fluid itself as alubricant to these parts. That is, the pipe 81, leads fluid from thepressure chamber 30, through the pipe 81, at one side of the drivingrotor, and by suitable connections to the pipe 92, leading to a coredout passage 93, in the casing 1, which conducts the fluidunder pressureto the inner ends of the rotor elements, a pipe 90, also connected inthe line leading to a pipe 91, to admit the fluid to the end of thedriven rotor elements at the outer end of the casing. The pipes 96,

which communicate through the lower end of the casing in the drivingrotor compartments, are also connected to the pipe lines to receive thefluid under pressure therefrom, thus lubricating the bearings for therotor. Either one of two sets of piping systems is in use, dependentupon the direction of rotation of the driven rotor for conducting fluidunder pressure to either the upper or lower portions of the bearingsthereof, as the case may be, and these connections are clearly shown inFig. 5. One pipe 97, is adapted to receive fluid from the chamber 63,when this is the entrance chamher for one direction of rotation of thepipes 102, at the lower end'or aar- The as nn-mi, the motive fluid usedin this mmhanmns ings of the rotor elements.

oil, serves to maintain all ofgthe lubricated, so that wear uponethepartq isa negligible quantity and easeof operatiqsratn all times isassured. ,5 x I am aware that various details .p',-construction may bevaried through a wide range without departing from the principles 7 ofthis invention and I therefore rdo not purpose limiting thepatentgrantodmthen wise than-necessitated by the seopesgi the ap endedclaims. I

claim as my invention: f 1. In a fluid power transmission iievioe, adriving power element for gmaintajning a flow of fluid, a drivenpowenelem j .be driven by the flow of fluid, a incasing said driving anddriven elements and cored out on its interior toafi er municationtherebetween for ppfthe. fluid, and slidable means for cpntr' lling thequantity of fluid passing thro the device to vary the speed transmitte2. In a fluid transmission deviceofi the class described, a rotary fluidcomp' member, a casing within which the aame'is mounted, a rotary membera driven by the compressed fluid also mounted within said casing,mechanism fior the flow of fluid between saidm frs, to change thedirection: of rotationafo; the driven member, and slidable means f lingthe quantity of fluid passing the mechanism to vary the speed andgpowertransmitted.

3. In a fluid transmission devioeof the class described, .a rotary fluidcom member, a rotary member adapts driven by the compressed fluid,mechanisms for reversing the flow of fluid to said member and forbypassing the fluid taprovent. flow to the driven member, andmaekactuated means controlling the flay, of fluid passing through thetransmission device. 1

4. In a device of the class described, {a casing, a pair of rotorchambers cored out therewithin, rotor elements mounted within saidchambers, passages affording communication between said rotor chambers,means reversing the flow of fluid in thins IQ: between said chambers,and rack pimon mechanism controlling the flow of fluidto one of saidrotors whereby the, fluid 0pm- Pressed h y and adm ted t thmtli r we; tobe rotor'may be varied-in quantity to vary the" power and speed to betransmitted by' said second mentioned rotor. r

5 In a fluid transmission device of the class described, a rotary fluidcompressing member, a rotary driven member a dapte'd'to be driven by thefluid from said comjnressing member, each ot'said-members embracing arotatable cylindrical element and rotary compressing element, aneccentrically mounted rotary element adapted to be driven by a fluidcompressed by said compressing element, passages afl'ordingcommunication between said respective elements for passage of the fluidtherethreugh, and passage connections between the respective pressurechambers of'said elements and arranged to convey the fluid underpressure to thebearings of the elements and to balance the same withinthe casing.

8. In a hydraulic transmission'of the class described, a casing,'drivingand driven elements mounted therein, the driving element adapted toimpart movement to a fluid in said casing to drive said driven element,a chamber form'edin said casing adapted to receive the fluid thereinunder pressure, and passages communicating with ,said chamber andleading to opposite sides or said elements to balance the same in their:inovement in the casing -9. In a hydraulictransmission of the classdescribed,'eccentrically mounted driving and driven element's,connections therebetween whereby fluid driven by the driving element isconveyed to the driven element to drive the same, passages to conveyfluid under pressure to opposite sides of said elemoms to balance thesame forlmoveme'nt,

and means controlling the fluid admitted to the driving'element to varythe speed and power transmitted by the transmission.

' 10. In a device of the class described,

casing, driving and driven elements mounted therein," a chamber adaptedto receive the fluid pumped by the driving element under pressure,passages communicating with said chamber and leading to each side ofsaid elements tobalance the same in their movement in the casing, andmeans throttling the fluid admitted to the driving element to vary thespeed and power transmitted by the driven element.

11. In a hydraulic transmission or the classi'lescribed, a casing,driving and driven elements movably mounted therein whereby V a flow offluid is induced by the driving ele- -ment to drive the driven element,a chamber having an air trap therein to receive the fluid under pressureto compress the air in saida ir trap to permit passage of the fluid to.the driven element, and a slidable gate plate controlling the flow offluid to the 1 driving element to vary the power and speed transmittedby the driven element. V

12. In a device of the class described,

a casing, driving and driven rotors therein,

passages affording communication therebetween whereby fluid may bepumped by the driving rotor to drive the ;driven rotor, packing ringsinterposed between the rotors and casing, and passages for transmittingthe pressure of fluid pumped by the driving rotor to opposite ends ofsaid respective rotors to balance thesame for rotation in said casing. r

13. In a device'ot the class describecha casing, driving and drivenrotors mounted itherein, passages affording communication therebetweenwhereby fluid pumpe'dby the driving rotor serves to drive the drivenrotor, packing rings concentrically mounted with respect to the rotorsat the ends thereof to seal the same in the casing, and segmentalretaining rings-adapted to be placed' into interfltting:rel ation in thecasing to hold said packing rings in place. v

14E. In a device of the class described the combination with a casingand its driving.-

and driven rotors mounted therein having complemental circular grooves'registerlng with one another in said respective casing and rotors, ofpacking rings'mounted in said registering grooves to afford a seal forthe rotors in the casing.

' 159111 a device of 'the'class describecha casing, rotors mountedtherein, 'the' one adapted to pump fluid through said casing" todrivethe other, an air pressure chamber communicating with line of fluidcommuiiication between said rotors to afford an. air cushion "for fluidunder pressure,: a check valve 111 the line ofcommunieation between saiddriving and driven rotors, and pressure lines leading to the oppositeends of the rotors and in communication with the line of fluid pressurebetween said driving and driven rotors to balance the rotors in thecasing. V

16. In a deviceof the class described, a

casing having grooves therein, a rotor mounted therein hav ng peripheralgrooves therein registering with saidcasing grooves, packing rings 1nsald registering grooves to afford a seal for said rotor and easing,diametrically oppositely disposed packing elements associated with saidrotor, and a packing member mounted in the casing for contact with theperiphery of the rotor.

17. in a device of the class described, a casing, a rotor mountedtherein, said rotor and casing having peripheral registering grooves.packing rings inserted therein, and passages formed in said casing toadmit fluid to the opposite ends of said rotor pumped thereto underpressure by said rotor to balance the rotor in its casing and equalizethe thrust due to fluid pressure on the respective packing rings.

18. In a device of the class described, a casing. driving and drivenrotors therein, passages affording fluid communication between saidrotors whereby fluid pumped by the driving rotor may serve to drive thedriven rotor, and passages formed in said casing communicating with theline of fluid pressure between said rotors to admit fluid to theopposite ends of and at the journals of said rotors to balance the samein said casing and afford a pressure lubrication therefor.

19. In a device of the class described, a casing, driving and drivenrotors mounted therein, passages affording communication for fluidwhereb'y fluid pumped by the driving rotor may serve to drive the drivenrotor, packing means associated with said respective rotors and casingto confine the effect of fluid pressure to the compartments within saidcasing in which the rotors operate, passages affording communicationbetween the line of fluid pressure and the ends of said respectiverotors to balance the same in the casing and lubricate said rotors, andretaining means at the ends of said casing for said packing means toconfine the fluid within the casing and prevent loss of pressuretherefrom.

20. In a device of the class described, a fluid compressing mechanism,and a driven mechanism adapted to be driven by the fluid from saidcompressing mechanism, each of said mechanisms comprises a casing, ashaft therein, an eccentric cylinder rigidly secured thereon, a ringjournaled thereon, diametrically opposite flat surfaced extensionsthereon, a yoke having flattened surfaces on the exterior thereofslidably mounted upon said flattened extensions and rotatable as a unitwith said ring, an apertured cylinder within the casing having flatsurfaces therein to permit the flattened surfaces of said yoke toslidably engage the same, diametrically oppositely disposed abutmentmembers on said yoke slidably engaged through said cylinder apertures,and a packing in each of said abutment members to contact the innersurface of said casing as said mechanisms are rotated.

21. In a hydraulic transmission device of the class described, a drivingand a driven means, each embracing a casin a slotted cylinder rotatabletherein, a yo e slidably mounted therein, abutment members securedthereon and slidably projecting through said cylinder slots to engagethe inner surface of said casing to form an eflicient seal, a ringmember slidably mounted within said yoke, and eccentric means journaladtherein for supporting the same.

In testimony whereof I have hereunto subscribed my name in the presenceof two subscribing witnesses.

CARLYLE B. FUNK.

Witnesses:

CHARLES W. HILLS, Jr., EARL M. HARDINE.

